Compatibility with Django 2.2

[Jeff]

I have recently created a related issue on github but didn't receive any response (https://github.com/stephenmcd/mezzanine/issues/1928). Basically Mezzanine compatibility with Django 2 is limited to 2.0 which is no longer supported. Moreover that compatibility is not fully tested.

I need to upgrade a legacy site which is based on Mezzanine 3.4.1 and Django 1.8. Ideally we would like to upgrade to Django 2.2 because it's an LTS version and we could stay on that until April 2022.

There are a few options but I'm lacking information to make a good decision:

1. wait until Mezzanine officially supports Django 2.2, but I have no idea when or if that will happen. It seems to me, that at the current pace it won't happen this year. (It's not a negative judgement, I'm very grateful for being able to use a free and mature CMS for many years on so many site!). Do you have any roadmap or even some approximate schedule?
2. fork Mezzanine and upgrade things myself but with a prioritisation based on the need of my site. Hopefully I'd be able to contribute back to the main repo. However I have no idea how much work would be involved? Is it a 2 day job or a 2 week job? Do you have any sense of how much work would is left, which Mezzanine components need to be worked on for 2.2 compatibility?
3. automate the migration of the content to another CMS, that would be more sustainable but would also require quite a lot of development. This is my least favourite option (because I can't think of a better Django-CMS for my particular needs) but at least I can accurately assess the development effort and time-frame.

Thanks in advance for any piece of information that could help me and my team better evaluate the situation.

Geoffroy

[Danny]

Hi Jeff,

I'm kind of in the same boat - although my site is on Django 1.11 and I could probably leave it there, although there's some 2.x features I'd like to use.

To be honest, I'd recommend attempting No. 2) (fork and attempt to upgrade it yourself) - and yes, if your changes aren't going to break too many backwards compatibility things, a pull request when you're done may be useful.

Inspired by your post, I made a quick start on this yesterday, with mezzanine and cartridge, and after about 5 small fixes (and a bit of research), managed to get past the initial "createdb" step of setup. I've not pushed my changes back to my forks yet, but it wasn't too much effort to get this far. I'll summarise the changes below to get you started. There's probably more things to do based on actual operation of Mezzanine, but this should be enough to at least generate a new test site.

Hopefully with a number of people working on this we can support Django 2.2 without also breaking Django 1.11 compatibility... A tricky task, no doubt!

Seeya. Danny.

~~~~

Mezzanine changes:

core/templatetags/mezzanine_tags.py

TOKEN_BLOCK, TOKEN_COMMENT, TOKEN_VAR and TOKEN_TEXT are no longer members of django.template.base. Instead, import TokenType and replace the references with TokenType.BLOCK, TokenType.COMMENT etc.

project_template/project_name/settings.py

django.contrib.messages must be added to INSTALLED_APPS

Cartridge changes:

shop/models.py

Replace @models.permalink decorator on get_absolute_url() with using reverse inside the method, i.e.

    def get_absolute_url(self):
        return reverse("shop_product", args=(self.slug,))

project_template/settings.py

Remove django.contrib.auth.middleware.SessionAuthenticationMiddleware from list of middlewares. It's no longer required from Django 1.10 and has been removed in Django 2.0 (see https://docs.djangoproject.com/en/2.2/releases/2.0/#miscellaneous)

django.contrib.messages must be added to INSTALLED_APPS

shop/views.py

Replace from django.core.urlresolvers import reverse with from django.urls import reverse

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[Enrico Tröger]

Hi all,

there is some progress in
https://github.com/stephenmcd/mezzanine/issues/1928 and
https://github.com/stephenmcd/mezzanine/pull/1934.

Regards,
Enrico

>>  1. wait until Mezzanine officially supports Django 2.2, but I have no

>>     idea when or if that will happen. It seems to me, that at the
>>     current pace it won't happen this year. (It's not a negative
>>     judgement, I'm very grateful for being able to use a free and
>>     mature CMS for many years on so many site!). Do you have any
>>     roadmap or even some approximate schedule?

>>  2. fork Mezzanine and upgrade things myself but with a prioritisation

>>     based on the need of my site. Hopefully I'd be able to contribute
>>     back to the main repo. However I have no idea how much work would
>>     be involved? Is it a 2 day job or a 2 week job? Do you have any
>>     sense of how much work would is left, which Mezzanine components
>>     need to be worked on for 2.2 compatibility?

>>  3. automate the migration of the content to another CMS, that would

>>     be more sustainable but would also require quite a lot of
>>     development. This is my least favourite option (because I can't
>>     think of a better Django-CMS for my particular needs) but at least
>>     I can accurately assess the development effort and time-frame.
>>
>> Thanks in advance for any piece of information that could help me and
>> my team better evaluate the situation.
>>
>> Geoffroy
>>
>> -- 
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